Am 16.07.2012 21:21, schrieb Chaanakya:
> I'm not sure exactly where this bug lies, but pinning it on difference seems to
> be the most logical thing.  Here's some sample code:

This is actually not really a bug, but merely a (currently) inevitable 
limitation: When tracing a ray from some surface, POV-Ray must make sure 
to ignore intersections with the very same or a coincident surface. To 
be robust against rounding errors, it does this by comparing the 
distance to the intersection with a certain minimum distance threshold.

The threshold was changed during the development of 3.7 (I'm not sure 
why though).

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